A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 5 years ago

A bag cotains 3 blue marbles and 5 red marbles samuel chooses a marble at random then without replacing the marble he chooses another marble at random what is the probability that he chose 2 red marbles

  • This Question is Closed
  1. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    There are 8 marbles in the bag. The chance of picking a red ball is 5 out of the 8 - 5/8 On the second go, you have one less red ball. So, the chance of picking a red ball is 4 out of the remaining 7 - 4/7 In simple probability, and=* multiply or=+ add So its the first probability AND the second probability. Did that help?

  2. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes it did but i have another one for you can you help

  3. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    charles's mp3 player has 100 songs on it of those 40 are hip hop 30 are rock and 30 are rap the mp3 player is set to random and once a song has been played it cannot be played again what is the probability that the first song he listens to is a rap song and the second song is a hip hop song

  4. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    So, it's like the marble problem. What's the probability that the first song is Rap? It's the number of Rap songs over the total number of songs. Then find the probability for the second part, using the number of Hip Hop songs out of the remaining songs. Then we either need to Add or Multiply the two together. What do you think?

  5. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok i am confused sorry

  6. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    So the first part of the question is: Pick out a Rap song, from all the songs. There are 20 Rap songs and 100 songs in total. 20 Rap songs, out of 100 song. So like the marbles (where it was 5 red marbles out of 8 - 5/8) here is 20 rap songs out of 100 songs - 20/100 (which is 1/5 when we cancel down). Now we are left with 99 songs (as that song can be played twice. The second part asks us to pick out a Hip Hip songs. Whats the probability of picking out a Hip Hop song from the songs that are left?

  7. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so would it be 99/100 or like 1/4

  8. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    There are 99 songs left (100-1) There are 20 Hip Hop songs. The probability is 20/99 (how many of what we want divided by how many are left in total). Does that make sense?

  9. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    well i divided it by 20 and 99 then also as a fraction and got for both of them 0.20202020202

  10. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I see what you're trying to do but you're making a bit more complicated. Its 20 Rap songs out of the 100 songs, then 20 Hip Hop songs out of the remaining 99 songs. (20/100)AND(20/99) = (20/100)*(20/99)=0.04040404... = 0.04

  11. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    k so a spiner has 11 equal sized spaces with 7 spaces red and 4 blue a number cube is numbered 1 to 6 the girl spins the spinner and rolls the number cube what is the probability that the spinner lands on red and the umber cube shows an odd number

  12. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    a 7/22 b 2/11 c 7/66 or d 2/33

  13. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.